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I'm not familiar with the Backbone code or config. However, it sounds like you are setting an argument by specifying a function name in a string. If you want to specify multiple functions, then instead of specifying them in a string I'd say Backbone should accept either a string or a function as the argument value. That would let you define your event handler in-place, and you could define one that just calls a series of other functions.

No, that's not quite it. It's simply that you're now allowed to bind and trigger multiple event names in a single call, as in jQuery. For example:

    book.on("change:title change:author", function() {

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